##### 



Exhibit 10.1.3
   
    
    LNP, LLC (Midwest)
    
    Southwest Region Portability Company, LLC
    
    Western Region Telephone Number Portability, LLC
    
    Southeast Number Portability Administration Company, LLC
    
    Mid-Atlantic Carrier Acquisition Company, LLC
    
    West Coast Portability Services, LLC
 
 AMENDMENT
 OF
 AGREEMENT FOR NUMBER PORTABILITY ADMINISTRATION
CENTER / SERVICE MANAGEMENT SYSTEM
 FOR
 LAW ENFORCEMENT AGENCY ACCESS




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Amendment No. 53 (MA)
    
    June 1, 2006SOW:
    
    þ Noo Yes
 AMENDMENT
OF
AGREEMENT FOR NUMBER PORTABILITY ADMINISTRATION
CENTER/SERVICE MANAGEMENT SYSTEM
FOR
LAW ENFORCEMENT AGENCY ACCESS
 1. PARTIES
 Amendment Master Agreement Master Agreements Contractor Customer Subscribing Customer
 2. EFFECTIVENESS AND DEFINED TERMS
 st Amendment
Effective Date Subscribing Customers
 
    
    Mid-Atlantic Carrier Acquisition Company, LLC
    
    LNP, LLC (Midwest)
    
    Northeast Carrier Acquisition Company, LLC
    
    Southeast Number Portability Administration Company, LLC
    
    Southwest Region Portability Company, LLC
    
    West Coast Portability Services, LLC
    
    Western Region Telephone Number Portability, LLC
  3. CONSIDERATION RECITAL
  2




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##### 



Amendment No. 53 (MA)
    
    June 1, 2006SOW:
    
    þ Noo Yes
 4. BACKGROUND
 IVR under SOW 6
 IVR
 Request for Improved Access
  5.
    
    AUTHORIZATION FOR CONTRACTOR TO PROVIDE CERTAIN USER DATA TO QUALIFIED RECIPIENTS
  15.8 Law Enforcement Agency Access
 Scope Qualified LEA LEAP LEAP Service.
 3




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##### 



Amendment No. 53 (MA)
    
    June 1, 2006SOW:
    
    þ Noo Yes
    LEAP Service Agreement. LEAP Service
Agreement
 4




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##### 



Amendment No. 53 (MA)
    
    June 1, 2006SOW:
    
    þ Noo Yes
  Relationship to NPAC/SMS Services
 Liability
 Inapplicability of Service Levels, GEP Elements and Benchmarking
Process.
 5




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##### 



Amendment No. 53 (MA)
    
    June 1, 2006SOW:
    
    þ Noo Yes
  Required Provisions of LEAP Service Agreement.
 User Data Elements Provided LEA Data Elements
 LEAP Provisioning
 6




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##### 



Amendment No. 53 (MA)
    
    June 1, 2006SOW:
    
    þ Noo Yes
 Manner of Access
 Exclusive Use
 Compliance with Laws
 Acknowledgment of Non-liability of Customer and Users Unpaid Charges
 7




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##### 



Amendment No. 53 (MA)
    
    June 1, 2006SOW:
    
    þ Noo Yes
  Termination
 Liability, Indemnification and Dispute Resolution
 Compensation
 Remain User Data
 Qualification.
 Application Law Enforcement Agencies or LEAs
  8




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##### 



Amendment No. 53 (MA)
    
    June 1, 2006SOW:
    
    þ Noo Yes
 Qualification
 Evaluation LEA Sources
 Confirmation Process
 Annual Reports
 Compensation
 Basis LEAP Charges
 9




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##### 



Amendment No. 53 (MA)
    
    June 1, 2006SOW:
    
    þ Noo Yes
  Cost Plus the Fee.
 Cost Cost
  
  
 Fee Fee
 Allocation.
 10




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##### 



Amendment No. 53 (MA)
    
    June 1, 2006SOW:
    
    þ Noo Yes
  Cost Review. Contractors Auditor LEAP Cost Review" LEAP Cost Report LEAP Review Documents
 Customers Auditor
 11




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##### 



Amendment No. 53 (MA)
    
    June 1, 2006SOW:
    
    þ Noo Yes
    Audit of Section 15.8 Performance LEAP
Service Audit
 12




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##### 



Amendment No. 53 (MA)
    
    June 1, 2006SOW:
    
    þ Noo Yes
  LEAP Service Audit Report
 Neutrality Reviews ( Assignment Agreement
 13




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##### 



Amendment No. 53 (MA)
    
    June 1, 2006SOW:
    
    þ Noo Yes
  Additional Causes for Termination
 IMPACTS ON MASTER AGREEMENT
  None
    
    Master AgreementNone
    
    Exhibit B  Functional Requirements SpecificationNone
    
    Exhibit C  Interoperable Interface SpecificationNone
    
    Exhibit E  Pricing SchedulesNone
    
    Exhibit F  Project Plan and Test Schedule
 14




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##### 



Amendment No. 53 (MA)
    
    June 1, 2006SOW:
    
    þ Noo Yes
 None
    
    Exhibit G  Service Level RequirementsNone
    
    Exhibit H  Reporting and Monitoring RequirementsNone
    
    Exhibit J  User Agreement FormNone
    
    Exhibit K  External DesignNone
    
    Exhibit L  Infrastructure/HardwareNone
    
    Exhibit M  Software Escrow AgreementNone
    
    Exhibit N  System Performance Plan for NPAC/SMS ServicesNone
    
    Exhibit O  Intermodal Ported TN Identification Service Agreementþ
    
    Exhibit P  LEAP Service AgreementNone
    
    Disaster RecoveryNone
    
    Back Up PlansNone
    
    Gateway Evaluation Process (Article 32 of Master Agreement)
 7. MISCELLANEOUS
   Ineffectiveness Determination
 15




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##### 



Amendment No. 53 (MA)
    
    June 1, 2006SOW:
    
    þ Noo Yes
 Unpaid Charges
      16




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##### 



Amendment No. 53 (MA)
    
    June 1, 2006SOW:
    
    þ Noo Yes
 [THIS SPACE INTENTIONALLY LEFT BLANK]
 17




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##### 



Amendment No. 53 (MA)
    
    June 1, 2006SOW:
    
    þ Noo Yes
  CONTRACTOR: NeuStar, Inc.By:
    
    /s/ Michael OConnorIts:
    
    VP - Customer RelationsDate:
    
    19 July 2006
 CUSTOMER: North American Portability Management, LLC as successor in interest to
and on behalf of Mid-Atlantic Carrier Acquisition Company, LLC
 By:
    
    /s/ Melvin ClayIts:
    
    Co-ChairDate:
    
    6/28/2006By:
    
    /s/ Timothy J. DeckerIts:
    
    Co-ChairDate:
    
    7/19/2006
 18




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##### 



Amendment No. 53 (MA)
    
    June 1, 2006SOW:
    
    þ Noo Yes
 ATTACHMENT 1
 TO
 AMENDMENT NO. 53
 Exhibit P to Master Agreement  LEAP Service Agreement
 19